Impact tool



W. H. SHORKTELL AND F. L. SUTLIFFE. IMPACT TOOL. APPIIcATIoN FILED MIIIL24, 1921.

1,427,556,l PaIenIedAug. 29, 1922 A TTOH/VEKS entren stares Parent orties.

WLLIAM H. SHORTELILAND FRANK L. SUTLIFFE, 0F WEST HAVEN, CONNECTICUT, ASSIG-NORS TO MILLER/S FALLS COMPANY, OF MIT-:LEES FALLS, MASSACHUSETTS,

A CORTEOBATION OF MASSACHUSETTS.

IMPACT TOOL.

Specification of LettersPatent. Patented Aug. 29, 1922i.

Application filed March 24, 1821. Serial No. 455,025.

To all whom it may camera.'

, Be it known that we, limitait H. Si-Ion- TELL and FRANK L. Snfrmrrn, citizens of the United Sta-tes, residing at Test Haven, in the vcounty of New `Haven and State of Connecticut, yhave invented new and useful Improvements in lmpact Tools, of which the iollowing` is a specification.

This invention relates to an impact tool such as a nail-set, which includes an elongated body formed at one endtor engage a nail head, or otherwise formed according to the function of the tool, and provided at its opposite end with` a tlatesided enlargement adapted to sustain the blows ofga hammer, and to prevent the tool from rolling when laid on a flat surface, the tool being composed essentially of two members, one of which is substantially cylindrical andv forms thebody, while the other is externally polygonal and forms the enlargement.

The object of the invention is to provide an impact tool the members of which are adapted to be engaged with each other first by friction, caused by the engagement of straight knurled teeth on the body with the wall of a socket in-the enlargement, and then positively by the radial outward displacement of portions of said teeth.

The invention is embodied in the improvements hereinafter described and claimed.

Of the accompanying drawings forming a part of this specification,-

Figure 1 is a side view of a nail-set embodyingr the invention..

Figure 2 is a side elevation of the body member alone. p

Figure 3 is an enlarged section on line 3-3 of Figure 1.

Figure 4' is a section on line 4 -4 of Figure 3.

Figures 5, 6 and 7 represent a modification, Figure 5 being a side view of a portion of the body member, Figure 6 a sectional view of the enlargement-forming member or cap, and Figure 7 is a sectional view showing the body member and cap positively interlocked.

The same reference characters indicate the same part-s in all of the gures.

We will first describe the preferred construction shown by Figures 1, 2, 3, and 4. rll`he body member 12 is of substantially cylindrical form, its axis being elongated.

@ne portion of the said member is tapered yand cupped at 13 to engage a nail head. A

Zone of the body member at the opposite end portion is preferably knurled to provide straight longitudinal teeth 15, parallel with the longitudinal axis; of the body member and adapted to indent the wall of' a socket 17 in a capi member lforming the enlargement of the tool. Another Zoney of' the body member may be provided with diamond knurling 19, lto afford a suitable gripping surface.y

The capmember 16V has a head 2O closing one end of the socket 17, and said socket is-formedfto have a close driving fit on the knurled teeth 15', so that whenfthe cap mem-V ber is forced onto the body member, af firm frictional engagement is set up between the members, the teeth 15 slightly indenting the wall of thel socket.

Thel cap member is provided with. means whereby hammer blows sustained by the head 20, are caused to spread the end face of the body member within the cap, and thus displace portions of the teeth v15 radia-ily outward into positive interlocking en-y gagement with the cap member, said means being embodied in a hardened steel ball 22, interposed between said end face and the head 2O. To facilitate the spreading of the end face, we provide it with a recess 23, re-` ceiving a portion of the ball.

It will now be seen that when the cap member has been frictionally engaged with the body member, the subsequent use of the tool involves a positive and constantly maintained interengagement between said members.

In the modification shown by Figures 5, 6, and 7, the body member has areduced zone provided with a straight knurling.

7e find that by knurling a cylindrical end portion of the body member, we are enabled to secure a close frictional fit between the wall of the socket 17 and the portion of the body member inserted therein,

of the knurled teeth engage the socket wall more effectively than would a radially expanded smooth surface.

` punch,

ln both the en'ibodiments tion illu,c rated y yct vthe .tool n'il .be fr cion, so that they are not i red -while being handled in i the inven- L f D c, stock, prio to actual use, and when used a be positimly,interlockeiV ve ,longitudinal movement be-y i the tivo p,y rts will sothat n i tween them is ibsolutely prevented.

By making the implement in two parts, the body being of cylindrical form throughout its length and the polygonal shaped rap being` formed separately the manufacture *l eieol2 is expedited and after the completed tool has" bcen'used the cap which prevents rotation et the tool is as positively interloclred 'with the body itt it were integral therewith.'

lt is obvious that the improvement here inafter claimed may be embodied in various impact tools, such as a drive punch, a pin and adapted to be operated by blows'or" a hammeiglthe tool in'each case having an acting end shaped in accordance with the function of the tool', the acting,v end 1n the eX- ample here `shown being` cuppedto engage a nail'head.

' We claim: y l i l. An impact tool comprising an elongated body member having an acting end and a 4cylindrical portion at its opposite end c o it will be seen that the capy 1 a 'center punch, and a prick punch,

linurled to form straight longitudinal teeth parallel with the axis of the body member, the end 'face of the lmurled portion being provided with a recess, a cap member having a solid end forming a head and a socket which is open at one end of the cap member and closed at the opposite end by said head, the socket Wall being formed to bear upon and be indented by the teeth oi' the knurled portion, and a hardened ball interposed between said recess and the head ot the cap nr l er and operable by 'force exerted on said head to `spread the inner end of the lrnnrled portion and displace portions oi' the teeth thereof radially outward into positive interioclrino` engagement with the ca i niember. v

2. in impact toolcomprisingan elongated body member having an acting end and a cylindrical portion at its opposite end, and a capmember initially forme-d, separate from the body having' a solid end form-- ing)` ahead and a socket which receives the cylindrical end of the body, the cap and body being positively `interloclred and prevented from having relative longitudinal movement by radially deflected portions of the engagging surfaces of said parts. l

ln testimony whereof We have aiixed our signatures.

WILLIAM l-l. SHORTELL. FRANK L. SUTLIFFE. 

